What are the best meteorological conditions for manned space launch?

The best meteorological conditions for manned space launch mainly include: total cloud cover 0-30%, no precipitation; The ground wind speed is less than 8m/s; The horizontal visibility is greater than 20km; From 8 hours before launch to 1 hour after launch, there is no lightning activity within 30 -40 kilometers of the site; The maximum wind speed is less than 70 m/s at the height of 3 km- 18 km where the ship and arrow are launched.

The most important weather factor during launch is the high-altitude wind 8-15km above the ground. Liu said that this is the place with the highest wind speed in the atmosphere. Excessive wind speed will affect the attitude of the rocket. At the same time, if the wind shear is too large, such as the upper and lower wind speeds are different, or the wind direction is different, the rocket may be deformed.

Other factors affecting emissions include cloud cover, visibility, rainfall, surface atmospheric electric field intensity, etc.

Extended data

Weather has the greatest influence on two aspects of manned space launch: transshipment and launch.

Transshipment refers to the transfer of the 58.3-meter-high ship-arrow assembly from the assembly plant to the launching tower, with a distance of 1.500 meters, which is also the stage where the ship-arrow is exposed to the outdoor for the longest time.

Liu said that the biggest impact at this time was the shallow wind below 80 meters from the ground, because the spacecraft had refueled and the rocket had not refueled, and it was in a top-heavy state. Excessive wind speed may make the rocket out of balance.

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